Spring Framework - @Qualifier Examples

    @Autowired
    @Qualifier("basic-service")
    private MyService myService;

public class OrderServiceClient {

    @Autowired
    @Qualifier("OrderServiceA")
    private OrderService orderService;

    public void showPendingOrderDetails () {
        for (String orderId : Arrays.asList("100", "200", "300")) {
            System.out.println(orderService.getOrderDetails(orderId));
        }
    }
}

@Configuration
public class AppRunner2 {

    @Bean
    @Qualifier("OrderServiceA")
    public OrderService orderServiceByProvider1() {
        return new OrderServiceImpl1();
    }

    @Bean(name = "OrderServiceB")
    public OrderService orderServiceByProvider2() {
        return new OrderServiceImpl2();
    }

    @Bean
    public OrderServiceClient createClient() {
        return new OrderServiceClient();
    }

    public static void main(String... strings) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppRunner2.class);
        OrderServiceClient bean = context.getBean(OrderServiceClient.class);
        bean.showPendingOrderDetails();
    }
}

import org.springframework.beans.factory.annotation.Autowire;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;

public class AutowireNoExample4 {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new
                AnnotationConfigApplicationContext(Config.class);
        ClientBean bean = context.getBean(ClientBean.class);
        bean.doSomething();
    }

    public static class Config {

        @Bean(autowire = Autowire.NO)
        public ClientBean clientBean() {
            return new ClientBean();
        }

        @Bean
        public ServiceBean serviceBean1() {
            return new ServiceBean("Service Bean 1");
        }

        @Bean
        public ServiceBean serviceBean2() {
            return new ServiceBean("Service Bean 2");
        }
    }

    private static class ClientBean {
        @Autowired
        @Qualifier("serviceBean2")
        private ServiceBean serviceBean;

        public void doSomething() {
            System.out.println(serviceBean.getMsg());
        }
    }

    private static class ServiceBean {
        private String msg;

        public ServiceBean(String msg) {
            this.msg = msg;
        }

        public String getMsg() {
            return msg;
        }
    }
}